Combined fresh-air plate and sewer-gas check.



F N. ROWAN.

COMBINED FRESH AIR PLATE AND SEWER GAS CHECK.

APPLKCATION FILED )ULY15,19}6.

Patented Jang 30, 1917.

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FRANCIS N. ROWAN, OF NEW YORK, N. Y., ASSIGNOR TO WILLIAM J'. FLYNN, OF NEW YORK, N. Y.

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Speccaton of Letters Patent.

l Patented d an. 30, 191?.

Application filed July 15, 1916. Serial No. 109,491.

To all 'whom t may concern.'

Be it .known that l, FRANCIS N. Rowan, a citizen of the United States, and a resident of the "city of New York, borough of the Bronx, county of Bronx, and State of New York7 have invented a new and lmproved Combined Fresh-Air Plate and Sewer-Gas Check, of which the following is a full, clear, and exact description.

lThe invention relates to fresh air inlets for the vent and drain pipes of buildings, and its object is to provide a new and iinproved fresh air plate and sewer gas check mounted on the air inlet pipe and extending at the face of the wall of a building usually a short distance above the sidewalk and arranged to allow fresh air to pass into the vent and drain pipe and to close automatically on pressure of foul air or sewer gas from within the air inlet pipe to prevent such foul air and sewer gas from passing into and vitiating the surrounding air at the sidewalk.

y Another object is to prevent removal of the fresh air plate, or clogging the fresh air inlet pipe by mischievous children throwing refuse into the fresh air inlet pipe, thus keeping the fresh air inlet pipe at all times in proper working order and preventing siphonage of fixtures, traps or sewer gas from passing into the living apartments of the building.

ln order to accomplish the desired result, use is made of a perforate head having a connection with the fresh air inlet pipe and a normally open valve mounted to close the said head on pressure developing within the pipe, and to swing inward to more or less full open position on a suction within the pipe to allow fresh air to pass in corresponding volume through the head into the air inlet pipe.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a reduced side elevation of the combined fresh air plate and sewer gas check as applied; Fig. 2 is a sectional side elevation of the same on the line 2#2 of Fig. 3; Fig. 3 is a face view of the same; and Fig. 4 is a face View of the valve.

The head or plate is adapted to be seated against the cuter face of a wall 11, as

plainly indicated in Figs. 1 and 2, and the said head is provided on its hack with a neck 12 threaded eXteriorly to screw into the forward end of a ferrule 13 connected by a calked joint or other means 14 with the entrance end of the fresh air inlet pipe 15 connected in the usual manner with the Vent and drain pipe 16 connected with the sewer and rising in the building to the roof thereof. lThe head 10 is provided with perforations 2O opening into the neck 12 to allow fresh air to pass into the neck and through the same and the ferrule 13 into the fresh airinlet pipe 15 to effectually pass into the pipe 16.

The inner end 21 of the neck 12 is somewhat reduced and is provided with a valve seat 22 inclined downwardly and outwardly, as plainly shown in Fig. 2, and this valve seat 22 is controlled by a disk valve 23 pivoted at its upper end at 24 to the back of the reduced neck portion 21 near the top thereof. By having the valve seat 22 inclined downwardly and outwardly it is evident that the valve 23 on account of being freely suspended is normally in slightly open position but is adapted to be seated on the valve seat 22 on pressure of foul air or sewer gas developing in the pipe 15. When the suction action is produced in the pipes 16 and 15 then the valve 23 is free to swing into a further open position thus allowing a corresponding volume to readily pass through the head into the pipe 15 and from the latter into the pipe 16. The opening 25 corresponds approximately to the inner diameter of the fresh air inlet pipe 15, and the ferrule 13 is provided with an inwardly extending annular bend 26, the inner diameter of which likewise corresponds to the inner diameter of the pipe 15 so that a large amount of air can readily pass through the head into the pipe 15. The perforated portions of the head 10 slightly bulge outward to enhance the ornamental appearance of the head and to provide suiiicient room for the perforations 20, the aggregate area of which corresponds to the cross sectional area of the pipe 15.

When placing the parts in position an aperture is made inthe wall 11 and cement is placed around the ferrule 13 prior to screwing the head 10 into the ferrule 13 so that the same engages the back portion of plate 19 outside of the neck 12 to securely cement the head in place and thereby prevent unscrewing of the same by mischievous persons.

When it is desired to make a water test of the plumbing system the head 10 is unscrewed from the ferrule 13 and a test plug is screwed into the said ferrule, the test plug having the usual tap for connection with a water supply to iill the plumbing system with water for testing purposes. After the test has been made the test plug is unscrewed and the head 10 with the valve 23 mounted on the neck 12 thereof is again screwed in position in the ferrule 13.

The valve 23 is preferably made of aluminum or other light material to allow the valve to readily swing into closed or full open position. K

By the use of the arrangement described fresh air can readily pass into the vent and dra-in pipe but foul air or sewer gas passing into the pipe 15 from the pipe 16 closes the valve 28 so that such foul air or sewer gas cannot pass'into the surrounding air at the sidewalk adjacent to the head 10.

By providing the head 10 with small perforations 20 the device is not liable to be clogged up by mischievous persons filling the air pipe 15 with refuse or other extraneous matter and hence the fresh air inlet pipe is at all times in proper working order, thus preventing siphonage of fixtures or traps, or sewer gas from passing into the living apartments of the building.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a fresh air inlet pipe, a perforate head having a neck connected with the entrance end of the fresh air inlet pipe and having its inner'end contracted and pro'- vided with an opening, the wall of which is tapered to provide a valve seat'inclined downwardly and outwardly, a valve pivoted to said neck and normally suspended in a substantially vertical position whereby the same is spaced from said valve seat to permit fresh air to enter said inlet pipe, said valve being adapted to swing into further open position on a suction action within said pipe and to swing outwardly against said seat to close said opening on pressure being exerted against the back of said valve.

2. In a fresh air inlet pipe, a perforate head having a neck connected with the entrance end of the fresh air inlet pipe and having its inner end contracted andprovided with an opening, the wall of which is tapered to provide a valve seat inclined downwardly and outwardly, a valve pivoted to said neck and normally suspended in a substantially vertical position whereby the same is spaced from said valve seat to permit fresh air to enter said inlet pipe, said valve being adapted to swing into further open position on a suction action within said pipes and to swing outwardly against said seat to close said opening'on pressure being exerted against the back of said valve, and a ferrule connected with the inlet pipe and into which said neck is threaded, said ferrule having an annular inwardly extending bend, the inner diameter of which is substantially the same as the opening in said neck and said inlet pipe.

FRANCIS N. ROWAN.

Copies ot this patent may be obtained for ve cents each, by addressing the Commissioner of Intente, Washington, D. 0. 

